Find the value of the unknown(s) in each diagram
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a)
Use tangent formula -
x(40+x) = 15*15
x^2 + 40x - 225 = 0
x^2 + 45x - 5x - 225 = 0
x( x + 45 ) - 5( x + 45) = 0
(x + 45)(x - 5) = 0
x = 5
Use tangent formula -
x(40+x) = 15*15
x^2 + 40x - 225 = 0
x^2 + 45x - 5x - 225 = 0
x( x + 45 ) - 5( x + 45) = 0
(x + 45)(x - 5) = 0
x = 5
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