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Factorize 2(x^2) - 2x - 12 fully

2(x 2 ) - 2x - 12= 2( x^2 - x - 6)The constant is negative so the 2 factors must have opposite signs. Then, the x term is negative so the larger one must be negative, and the smaller one positive. 2*(x3)=-6 ...
DH
Answered by Danielle H. • Maths tutor
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Rearrange 4(2x + y) = 11 + 7y to make x the subject

4(2x + y) = 11 + 7y expand the brackets8x + 4y = 11 + 7y move +4y to the other side8x = 11 + 3y move 8 to the other sidex= (11 + 3y)/8
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Answered by Ashley Y. • Maths tutor
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3^a = 1/9, 3^b = 9sqrt(3) c = 1/sqrt(3). Work out the value of a + b + c

I will explain best during the interview on the whiteboard space
EC
Answered by Eduardo C. • Maths tutor
11989 Views

A plane travels at 213 miles per hour. Work out an estimate for how long, in seconds, the plane takes to travel one mile.

213 miles/hour speed = distance/time round 213 to 200 as only an estimate; s=200/1 hour = 200/3600 seconds (then divide by 200 to get time for 1 mile)s = 1/18 at this speed, the plane travels 1 mile per 18 s...
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Answered by Owen W. • Maths tutor
14764 Views

A right angled triangle has sides a = 3 cm and b = 5 cm, what is the length of side c?

a^2+b^2=c^2Rearrange so that c = sqrt(a^2+b^2) = 5.83 cm
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Answered by Samuel P. • Maths tutor
3337 Views