15x²-28=x plz help some one
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Answered by
3
15x²-28=0
→15x²-x-28=0
→15x²+20x-21x-28=0
→5x(3x+4)-7(3x+4)=0
→(3x+4)(5x-7)
→15x²-x-28=0
→15x²+20x-21x-28=0
→5x(3x+4)-7(3x+4)=0
→(3x+4)(5x-7)
Answered by
6
☆ Given equation → 15x² - 28 = x
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☆ Solution → 15x² - 28 = x
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→ 15x² - x - 28 = 0
→ 15x² + 20x - 21x - 28 = 0
→ 5x(3x + 4) - 7(3x + 4) = 0
→ (3x + 4)(5x - 7) = 0
→ (3x + 4) = 0 Or (5x - 7) = 0
→ 3x + 4 = 0 Or 5x - 7 = 0
→ 3x = -4 Or 5x = 7
→ x = -4/3 Or x = 7/5 Ans.
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☆ Thus, x = -4/3 and 7/5 are the two roots of the given equation.
==============================================
☆ Solution → 15x² - 28 = x
==============================================
→ 15x² - x - 28 = 0
→ 15x² + 20x - 21x - 28 = 0
→ 5x(3x + 4) - 7(3x + 4) = 0
→ (3x + 4)(5x - 7) = 0
→ (3x + 4) = 0 Or (5x - 7) = 0
→ 3x + 4 = 0 Or 5x - 7 = 0
→ 3x = -4 Or 5x = 7
→ x = -4/3 Or x = 7/5 Ans.
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☆ Thus, x = -4/3 and 7/5 are the two roots of the given equation.
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