JAMB - Mathematics (1978 - No. 3)
Multiply (x + 3y + 5) by (2x2 + 5y + 2)
2x2 + 3yx2 + 10xy + 15y2 + 13y + 10x2 + 2x + 10
2x3 + 6yx2 + 5xy + 15y2 + 31y + 10x2 + 2x + 10
2x3 + 6xy2 + 5xy + 15y2 + 12y + 10x2 + 2x + 10
2x2 + 6xy2 + 5xy + 15y2 + 13y + 10x2 + 2x + 10
2x3 + 2yx2 + 10xy + 10y2 + 31y + 5x2 + 10
Explanation
\((x + 3y + 5)(2x^{2} + 5y + 2)\)
= \(2x^{3} + 5xy + 2x + 6yx^{2} + 15y^{2} + 6y + 10x^{2} + 25y + 10\)
= \(2x^{3} + 5xy + 2x + 6yx^{2} + 15y^{2} + 31y + 10x^{2} + 10\)
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