Question

please tell me all answer step by step please it's my huge request 10 points for it

Answer 1

As per your question,

4. Given that, x= 1
i). -x = -1
ii). 4x = 4 x 1 = 4
iii). -2x^2 = -2(1)^2 = 2

5. Given, x= -1
=> 4x+x-2x^2+x-1
=>-2x^2+6x-1
=> -2(-1)^2+6(-1)-1
=> -2-6-1
=> -9

6. Given, x=-2
Expn:- 5x^2-4-3x^2+6x+8+5x-13
=> 5x^2-3x^2+6x+5x+8-4-13
=> 2x^2+11x-9
Putting the value of 'x'.
=> 2(-2)^2+11(-2)-9
=> 8-22-9
=> -23

7. Given, x=1 & y=2
i). 4x-3y+5
=> 4(1)-3(2)+5
=> 4-6+5
=> 9-6
=> 3

ii). x^2+y^2
=> (1)^2+(2)^2
=> 1 + 4
=> 5

iii). xy+3y-9
=> 1 x 2 +3(2)-9
=> 2+ 6-9
=> 8-9
=> -1

8. Length = 9 cm & Breadth = 6 cm

Ar(Rectangle) = l x b
=> Ar(Rectangle) = (9 x 6) cm^2 = 54 cm^2

9. Given,

Principle (P) = Rs 900
Time (T) = 2 years
Rate (R) = 5% p.a.

=> S.I = PTR/100

$s.i \: = \frac{900 \times 2 \times5}{100}$
$s.i \: =rs. ( 9 \times 2 \times 5) = rs \: .90$



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