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Find the two real roots of the equation x^4 -5=4x^2 Give the roots in an exact form.

Disguised quadratic. Let y=x^2So quadratic become y^2-4y-5=0so (y-5)(y+1)=0so y=5 and y=-1so x^2 = 5 or -1cannot be -1 as not real henso x^2=5x=+-sqrt(5)
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Answered by Rishi J. • Maths tutor
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The straight line L1 passes through the points with coordinates (4, 6) and (12, 2) The straight line L2 passes through the origin and has gradient -3. The lines L1 and L2 intersect at point P. Find the coordinates of P.

Find equation of line 1 in terms of x. eg y=mx+c - Using gradient and points. Equation of line 2 is just y=-3xSo -3x=mx+c of line 1Find xSub into one equation to find the y point.Done
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Answered by Rishi J. • Maths tutor
10833 Views

A ball, dropped vertically, falls d metres in t seconds. d is directly proportional to the square of t. The ball drops 45 metres in the first 3 seconds. How many metres does the ball drop in the next 7 seconds?

d = kt 2 . 45 = k x 3 2 . 45 = k x 9 (/9). 5 = k.3+7 = 10 seconds total as we are investigating the NEXT 7 seconds. d = kt 2 . d = 5 x 10 2 . d = 5 x 100d = 500m in 10 seconds. As the ball drops 45m in the f...
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Answered by Emily N. • Maths tutor
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Wie sollte deiner Meinung nach Mobbing an Schulen in Angriff genommen werden?

Zunächst einmal ist es wichtig, die verschieden Arten des Mobbings an Schulen aufzudecken. Hierzu gehören zum Beispiel Cyber-Mobbing und/oder das Hänseln an der Schule. Für beide Arten bieten sich verschiede...
HH
Answered by Harun H. • German tutor
1868 Views

Describe how a vaccine results in immunity.

Vaccine contains dead or altered/weakened form of the disease-causing pathogen, which contains a specific antigen . The antigen stimulates an immune response , leading to production of B lymphocytes . Activa...
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Answered by Dide O. • Biology tutor
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