Top answers

Solve e^x-6e^-x=1

Multiply everything through by e x and rearrange so it equals zero you now have e 2x -e x -6=0 It is now similar to a quadratic equation, make the dummy substitution y=e x y=3 or -2 x= ln(3) and ln(-2) does ...
KI
Answered by Kishwar I. • Maths tutor
10872 Views

1iii) Solve 7/2x^2+13/4x+1=2

In order to solve this trickier problem, the quadratic equation must be applied x=[-b +- sqrt(b^2-4ac)]/2a Apologies for messy notation, full solution will be demonstrated during interview clearly when white...
KI
Answered by Kishwar I. • Maths tutor
4009 Views

1ii) sketch y=x^2-4x-21

A parabola shape with x intercepts at x = -3 and x = 7 and the y intercept at y = -21
KI
Answered by Kishwar I. • Maths tutor
4253 Views

1i) solve x^2-4x-21=0

Factorise to get (x+3)(x-7)=0 So you can see that x = -3 or x =7
KI
Answered by Kishwar I. • Maths tutor
4364 Views

Give the possible values of x when 2x^2-x-6=0

first of all the equation needs to be written in the form (ax+b)(x+c) because 2 can only be made by multiplying 2 and 1 we know that a=2 so (2x+b)(x+c) -6 can be made by multiplying 2 and -3, -2 and 3, -6 an...
NS
Answered by Nina S. • Maths tutor
4637 Views