Question

Use suitable identity and find the product of: (2a-7)(2a-7)

Answer 1

$\\ \sf\longmapsto (2a-7)(2a-7)$

$\\ \sf\longmapsto (2a-7)^2$

• (a-b)^2=a^2+b^2-2ab

$\\ \sf\longmapsto 2a^2-2(2a)(7)+49$

$\\ \sf\longmapsto 4a^2-28a+29$

Answer 2

Answer:

=4a2−28a+49

Step-by-step explanation:

(2a−7)(2a−7)

=(2a+−7)(2a+−7)

=(2a)(2a)+(2a)(−7)+(−7)(2a)+(−7)(−7)

=4a2−14a−14a+49