Question

Re-write the quadratic function below in Standard Form

y=-9(x+1)(x-7)

Answer 1

`\\ \rm\rightarrowtail y=-9(x+1)(x-7)`

`\\ \rm\rightarrowtail y=(-9x-9)(x-7)`

`\\ \rm\rightarrowtail y=-9x(x-7)-9(x-7)`

`\\ \rm\rightarrowtail y=-9x^2+63x-9x+63`

`\\ \rm\rightarrowtail y=-9x^2+54x+63`

Answer 2

y=-9x²+54x+63

Explanation:

y=-9(x²-7x+x-7)

y= -9(x²-6x-7)

y=-9x²+54x+63

hope this helps