Casharo Xisaab Form 4

Solve for x: 3x + 7 = 22 6 marks

1. Subtract 7 from both sides: 3x = 22 − 7
2. 3x = 15
3. Divide both sides by 3: x = 15 ÷ 3
4. Check: 3(5) + 7 = 22

Jawaab: x = 5

Find the area of a circle with radius 7 cm. (π = 3.14) 8 marks

1. Area formula: A = π r²
2. A = 3.14 × 7²
3. A = 3.14 × 49

Jawaab: A = 153.86 cm²

If f(x) = 2x² − 3x + 1, find f(4). 6 marks

1. Substitute x = 4: f(4) = 2(4)² − 3(4) + 1
2. = 2(16) − 12 + 1
3. = 32 − 12 + 1

Jawaab: f(4) = 21

Solve: 5x − 8 = 27

• x = 5
• x = 7
• x = 9
• x = 4

1. Add 8 to both sides: 5x = 35
2. Divide by 5: x = 7

What is the area of a square with sides of 9 cm?

• 18 cm²
• 36 cm²
• 81 cm²
• 27 cm²

1. Area of a square = side × side
2. 9 × 9 = 81 cm²

If f(x) = 3x + 2, what is f(5)?

• 15
• 17
• 13
• 20

1. Substitute x = 5: 3(5) + 2
2. 15 + 2 = 17