(4b^2-8b-3)
1st step: 3b^2– (-b^2) = 4b^2
2nd step: -5b – (3b) = -8b
3rd step: 1 – (-4) = -3
Answer:
x=20
Step-by-step explanation:
Since this is a right triangle, we can use the Pythagorean theorem
a^2 + b^2 = c^2
21 ^2 + x^2 = 29^2
441+x^2 =841
Subtract 441 from each side
x^2 = 841-441
x^2 = 400
Take the square root of each side
sqrt(x^2) = sqrt(400)
x = 20