The triangles are similar.

what is the value of x?

enter your answer in the box.

the way i was taught i have tried but it still ends up wrong no matter what i do. could i see a step by step process ?

21

Step-by-step explanation:

You can do it two different ways.

1st. Find the scale factor by dividing - 75/25=3 or 72/24=3

This means the scale factor is three

Then multiply the remaining side (7) by the scale factor (3) to get: 21

2nd. Use the Pythagorean Theorem - 75²-72²=x²

441 = x²

√441=x

x=21