Question

Find the product using suitable identity: (11x + 9) ( 11x – 5) ​

Answer 1

11x(11x+9)-5(11x+9)

121x²+99x-55x-45

121x²+44x-45

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Answer 2

$\Huge\sf\green{answer:}$

$\sf{ }$

$\bf{To~Solve:}$

$\sf{~~~~~~(11x+9)(11x-5)}$

$\bf{Identity:~(x+a)(x+b)=x^{2}+(a+b)x+ab}$

$\sf{:→ (11x)^{2}+[9+(-5)~]x+(9×-5)}$

$\sf{:→ 121x^{2}+(4)x+(-45)}$

$\sf{:→ {\green{\underline{\boxed{\bf 121x^{2}+4x-45}}}}}$