Question

find the product of : (m-9) × (m+11)
​

Answer 1

Step-by-step explanation:

Your question:

$(m - 9)(m + 11)$

Your answer:

$= (m - 9)(m + 11)$

[ it's important that you should all the identities of algebra. So here this identity is used: (x+a)(x+b) ]

$= m(m + 11) - 9(m + 11)$

[ multiply the terms and proceed to the next step: x(x+b)+a(x+b) ]

$= {m }^{2} + 11m - 9m - 99$

[ x^2 + ax + bx + ab. As you can see I wrote the steps how to solve this answer as well as how to solve the given identity ]

$= {m}^{2} + (11 - 9)m - 99$

[ x^2 + (a+b)x + ab. Grouping makes it more easier ]

Your final answer: m^2 + 2m - 99