4. The two legs of a right triangle are equal and the square of its hypotenuse is 50. Find the length of each leg.​

Step-by-step explanation:

Given

Required

Find the length of each leg

This is calculated using Pythagoras Theorem

Represent the opposite and adjacent with x

Divide both sides by 2

Take square roots

Hence:

option 3 . (5x + 1) - (-10x + 6)

step-by-step explanation:

option 1 :

(4x + 3) + (-9x + 4)

or 4x+3 -9x + 4

or -5x + 7

option 2

(x - 2) - (6x - 9)

or x-2-6x + 9

or -5x + 7

option 3

(5x+ + 6)

or 5x + 1 + 10x -6

or 15x -5

option 4

-4x+2x+7-3x

-7x + 2x + 7

-5x + 7

hence only option 3 did   not satisfy the given simplify expression.