Question

1. Solve 5x² = -45x.

Answer 1

x=0 or x=-9

Answer 2

5x (x + 9) = 0

Answer 3

How do yo work it out?

Answer 4

either 5x = 0 or x+9 = 0

Answer 5

so x = 0 or -9

Answer 6

\[5x^2=-45x\] divide both sides by 5
\[x^2=-9x\] add 9x to both sides
\[x^2+9x=0\] factor
\[x(x+9)=0\] set each factor equal to zero and solve
\[x=0,x+9=0\implies x=-9\]

Answer 7

Thank you!!