Multiply: 2x2 – 4x + 5 by X2 + 3x – 7 - Mathematics

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Sum

Multiply: 2x2 – 4x + 5 by x2 + 3x – 7

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Solution

2x2 – 4x + 5 by x2 + 3x – 7

(2x2 – 4x + 5) × (x2 + 3x – 7)

2x2(x2 + 3x − 7) − 4x(x2 + 3x − 7) + 5(x2 + 3x − 7)

2x4 + 6x3 − 14x2 − 4x3 − 12x2 + 28x + 5x2 + 15x − 35

2x4 + 6x3 − 4x3 − 14x2 − 12x2 + 5x2 + 28x + 15x − 35

2x4 + 2x3 − 21x2 + 43x − 35

Concept: Multiplying a Polynomial by a Polynomial
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APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 11 Algebraic Expressions
Exercise 11 (C) | Q 14.1 | Page 143
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