10) Evaluate:
7x+4{x2= (5x=10)} - 3{2-x} = (3x+=x)}}
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Answer:
7x + 4 {x2 ÷ (5x ÷ 10)} – 3 {2 – x3 ÷ (3x2 ÷ x)}
= 7x + 4 {x2 ÷ (5x/10)} – 3 {2 – x3 ÷ (3x2/x)}
= 7x + 4 {x2 ÷ x/2} – 3 {2 – x3 ÷ 3x} = 7x + 4 {x2 × 2/x} – 3{2 – ( x3/3x)}
= 7x + 8x – 6 + x2
Ans.= x2 + 15x - 6
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