Question

-

13. What should be added to 1,25 a b-0.7 ab +5.75 ab' to get 5.01ab
14. Simplify the expressions and evaluate their values as directed.
(a) 3y(2y - 7) - 3(y - 4) - 63 for y = -2
(b) -P-\m- n?)-p?(? - m²) +n+lp? - F )+ m² (nº -p?) for 1 = 1, m= -2,n=-1, p = 2
15. How much smaller is 2x3 - 2x + 5 than 7 + 5x + 3x ?
16. How much larger is 8x? - 9y2 than 3x – 2y??
Ansurer
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Answer 1

16 The value by which (8x^2 - 9y^2)(8x

2

−9y

2

) is larger than (3x^2 - 2y^2)(3x

2

−2y

2

) is as follows:-

\begin{gathered}(8x^2 - 9y^2) - (3x^2 - 2y^2)\\= 8x^2 - 9y^2 - 3x^2 + 2y^2\\= 5x^2 -7y^2\end{gathered}

(8x

2

−9y

2

)−(3x

2

−2y

2

)

=8x

2

−9y

2

−3x

2

+2y

2

=5x

2

−7y

2