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Multiply:(i) x2 + y2 + z2 − xy + xz + yz by x + y − z(ii) x2 + 4y2 + z3 + 2xy + xz − 2yz by x − 2y − z(iii) x2 + 4y2 + 2xy − 3x + 6y + 9 by x − 2y + 3(iv) 9x2 + 25y2 + 15xy + 12x − 20y + 16 by 3x − 5y + 4 |
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Answer» Multiply: (i) x2 + y2 + z2 − xy + xz + yz by x + y − z (ii) x2 + 4y2 + z3 + 2xy + xz − 2yz by x − 2y − z (iii) x2 + 4y2 + 2xy − 3x + 6y + 9 by x − 2y + 3 (iv) 9x2 + 25y2 + 15xy + 12x − 20y + 16 by 3x − 5y + 4 |
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