Question

Q1) Use the identity (x + a) (x + b) = x2 + (a + b) x + ab to find the following products.







(iv) (9x - 5) (9x-1)​

Answer 1

$\Huge\mathfrak\purple{answer:}$

$\sf{ }$

$\large\bf{{\underline{To~solve}}:}$

$\tt{~~~~~~(9x-5)(9x-1)}$

$\bf{Using~the~identity:}$

$\tt{~~~~~~(x+a)(x+b)=x^{2}+(a+b)x+ab}$

$\tt{:→ (9x)^{2}+[(-5)+(-1)~]9x+[(-5)×(-1)~]}$

$\tt{:→ 81x^{2}+(-6)9x+5}$

$\tt{:→ {\purple{\underline{\boxed{\bf 81x^{2}-54x+5}}}}}$

Answer 2

Answer:

(9×-5) (9×-1)= 81x- 54x+5