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Which of the following are quadratic equations?(i) x2 + 6x − 4 = 0(ii) 3x2-2x+12=0(iii) x2+1x2=5(iv) x-3x=x2(v) 2x2-3x+9=0(vi) x2-2x-x-5=0(vii) 3x2 − 5x + 9 = x2 − 7x + 3(viii) x+1x=1(ix) x2 − 3x = 0(x) x+1x2=3x+1x+4(xi) (2x + 1) (3x + 2) = 6(x − 1) (x − 2)(xii) x+1x=x2, x≠0(xiii) 16x2 − 3 = (2x + 5) (5x − 3)(xiv) (x + 2)3 = x3 − 4(xv) x(x + 1) + 8 = (x + 2) (x − 2) |
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Answer» Which of the following are quadratic equations? (i) x2 + 6x − 4 = 0 (ii) (iii) (iv) (v) (vi) (vii) 3x2 − 5x + 9 = x2 − 7x + 3 (viii) (ix) x2 − 3x = 0 (x) (xi) (2x + 1) (3x + 2) = 6(x − 1) (x − 2) (xii) (xiii) 16x2 − 3 = (2x + 5) (5x − 3) (xiv) (x + 2)3 = x3 − 4 (xv) x(x + 1) + 8 = (x + 2) (x − 2) |
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