8x²=60-7x² e mais uma xD que é x²-9=0 VLW
8x² = 60 - 7x²
15x² = 60
x² = 4
x1 = -2
x2 = +2
x² - 9 = 0
x² = 9
x1 = -3
x2 = +3
pronto
8x^2 = 60 - 7x^2
8x^2 + 7x^2 = 60
15x^2 = 60
x^2 = 60/15
x^2 = 4
x = 2
x^2 - 9 = 0
x^2 = 9
x = 3
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Verified answer
8x² = 60 - 7x²
15x² = 60
x² = 4
x1 = -2
x2 = +2
x² - 9 = 0
x² = 9
x1 = -3
x2 = +3
pronto
8x^2 = 60 - 7x^2
8x^2 + 7x^2 = 60
15x^2 = 60
x^2 = 60/15
x^2 = 4
x = 2
x^2 - 9 = 0
x^2 = 9
x = 3