Question

How do you factor the expression `d^2-14d+49`?

Answer 1

`(d-7)^2`

Explanation:

`"this is a "color(blue)"perfect square"`

`•color(white)(x)(a+-b)^2=a^2+-2ab+b^2`

`"here "a=d" and "b=-7`

`2ab=2xxd xx-7=-14d`

`d^2-14d+49=(d-7)^2`