Question

x^2 + 3x – 54 = 0

Answer 1

do you need to solve it..?

Answer 2

yes its a quadratic equation

Answer 3

ok... find the factors of -54 that add to 3..... the larger factor is positive and the smaller is negative

Answer 4

9 and -4

Answer 5

@campbell_st ??

Answer 6

close 9 - 4 = 5

and 9 x -4 = -36

Answer 7

9 is the larger factor

Answer 8

9 and -6

Answer 9

thats it so the factored form of the equation is

(x - 6)(x + 9) = 0

can you solve it from here...?

Answer 10

nooo!! @campbell_st

Answer 11

ok... so once its factorised..... you need to solve each part of brackets

x - 6 = 0


and

x + 9 =0



this is because is either expression in brackets is equal to zero the whole equation is equal to zero...

try and solve the 2 equations...

Answer 12

so the answer will be 6 and -9

Answer 13

correct.... of you substitute either value into the equation you will get 0 as the answer