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Answers
Answer:
Step-by-step explanation:
Section A
1. 4a + 3b + 3a + 2b 2. 6p - 36
4a + 3a + 2b + 3b =6(p - 6)
= 7a + 5b
3. Circumference = 2*22/7*7 4. Product= 4p (q+r)
= 44 cm = 4pq + 4pr
SECTION B
5. 5x = (40 - 35) (40 + 35) 6. + 9x + 20
5x = 5*75 + 4x + 5x + 20
5x = 375 ( + 4x) + (5x + 20)
x = 375/5 = 75 x (x + 4) + 5 (x+4)
= (x + 4) (x + 5)
7. 10ab/2a
= 5b 8. Circumference = 2r
110 = 2*22/7*r
110*1/2*7/22 = r
17.5 = r
9. (4x+9y) (4x - 9y)
SECTION C
1. Sum = 2x + 3y + 4x + 7y Subtract = 6x + 10y - (4x +9y)
6x + 10y = 6x + 10y - 4x - 9y
= 2x + y
1. 4a + 3b and 3a + 2b
= 4a + 3b + 3a + 2b
= (4a + 3a) + (3b + 2b)
= 7a + 5b.
2. 6p - 36
= 6(p - 36)
3. Radius = 7cm
C = 2πr = 2 × 22/7 × 7 = 44cm.
4. 4p[q + r]
= [4p × q] + [4p × r]
= 4pq + 4pr
5. 5x = (40)² - (35)²
=> 5x = 1600 - 1225
=> 5x = 375
=> x = 75
6. x² + 9x + 20
= x² + 5x + 4x + 20
= x(x + 5) + 4(x + 5)
= (x + 5) (x + 4)
7. 10ab ÷ 2a
= 10ab/2a
= 5b
8. Circumference = 110cm
C = 2πr
=> 110 = 2 × 22/7 × r
=> 110 = 44/7 × r
=> r = 7/44 × 110
=> r = 770/44 = 35/2 = 17.5cm.
9. 4x² - 9y²
= (2x)² - (3y)² [ Using a² - b² = (a + b) (a - b) ]
= (2x + 3y) (2x - 3y)
10. Adding 2x + 3y and 4x + 7y
= 2x + 3y + 4x + 7y
= (2x + 4x) + (3y + 7y)
= 6x + 10y
Subtracting 4x + 9y and 6x + 10y
= 4x + 9y - 6x + 10y
= -2x + 9y + 10y
= -2x + 19y.