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  • Simplify these expressions and find their values if x = 3, a = - 1, b = - 2. (i) 3x - 5 - x + 9

Q. 7.     Simplify these expressions and find their values if x=3,a=-1,b=-2.

            (i)  3x-5-x+9

            (ii)  2-8x+4x+4

            (iii)  3a+5-8a+1

            (iv) 10-3b-4-5b

            (v)  2a-2b-4-5+a

Answers (1)

best_answer

The expression is simplified as follows and also obtained their values

(i)

\\ 3x - 5 - x + 9 \\= 2x + 4 \\= 2 \times 3 + 4 \\= 10

(ii)

\\ 2 - 8x + 4x + 4 \\= 6 - 4x \\= 6 - 4 \times 3 \\= -6

(iii)

\\3a + 5 - 8a + 1 \\= -5a + 6 \\= -5 \times ( -1 ) + 6 \\= 5 + 6 \\=11

(iv)

\\10 - 3b - 4 - 5b \\= 6 - 8b \\= 6 - 8 \times ( -2 ) \\= 6 + 16 \\= 22

(v)

\\2a - 2b - 4 - 5 + a \\= 3a - 2b - 9 \\= 3 \times ( -1 ) - 2 \times ( -2 ) - 9 \\= -3 + 4 - 9 \\= -8

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