How can i find the length of a chord?

Consider the following equation -167 + 37 = 49 - 21p select the equation that has the same solution as the given equation. o a. p - 5 + ip = 7 - p ob. +55 + 12p = 5p + 16 c. 2 + 1.25p = -3.75p + 10 d. -14 + 6p = -9 - 6p reset next

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.