pa help po pls mathematics
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1)
x² - 81 = 0
(x + 9) (x - 9) = 0
x + 9 = 0 or x - 9 = 0
x = -9
x = 9
FINAL ANSWER:
→x = -9 or x = 9
2)
x² + 9x + 18 = 0
x + 3x + 6x + 18 = 0
x(x + 3) + 6(x+3) = 0
(x + 3) (x + 6) = 0
x + 3 = 0 or x + 6 = 0
x = -3
x = -6
FINAL ANSWER:
→x = -3 or x = -6
3)
x² - 13x + 30 = 0
x² - 10x - 3x + 30 = 0
x(x - 10) - 3(x -10) =0
(x - 10) (x - 3) = 0
x - 10 = 0 or x - 3 = 0
x = 10
x = 3
FINAL ANSWER:
→x = 10 or x = 3