Question

for which value of x does f(x)= -10, if f(x) = -4x^2+3x

Answer 1

@MrNood

Answer 2

put -10 where ther is an x in the f(x)

you will end up with a quadratic in x

Answer 3

is -4x^2+3x-10?

Answer 4

(btw this equation has 2 real solutions - so the question is wrong - there are 2 values...

Answer 5

nearly right - but you have made an error with - sign

Answer 6

oh yeah +10

Answer 7

how would you factor that?

Answer 8

-(2x+2) (2x-5)

Answer 9

@MrNood

Answer 10

I don't think it factorises

Use quadratic formula

Answer 11

or graph it:
https://www.desmos.com/calculator