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+10x+25= + 225
10x=200
x=20
2. 20 x 15 / 2= 150
(x+5)^2= 15^2 + x^2
x^2 + 10x + 25 = 225 + x^2
x^2 - x^2 +10x = 225-25
10 x = 225-25
10 x = 200
x = 200 / 10
x= 20
b. Luas segitiga
L= 1/2 alas × tinggi
L= 1/2 ×20×15
L= 150