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How do I do a and b someone pls help

How do I do a and b someone pls help-example-1

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Pythagoras theorem a^2 + b^2 = c^2
A = x, B = x + 2, C = x + 3
(a). x^2 + (x+2)^2 = (x+3)^2
(b). Expand
X^2 + (x+2)(x+2) = (x+3)(x+3)
x^2 + x^2 + 4x + 4 = x^2 + 6x + 9
x^2 = 2x + 5
x^2 - 2x - 5 = 0
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