Question

please answer this question please I will mark you Brainly list​

Answer 1

MULTIPLY :

(i) (-6x) × (-7xy) ×(-12x²y)

Sol :- - 6x × (-7xy) × (-12x²y)

= 42x²y × (-12x²y)

= - 504x⁴y²

(ii) 3x(2x - 7x²)

sol : 3x(2x - 7x²)

= 6x² - 21x³

(iii) -2x(7xy - 2x)

= -2x(7xy - 2x)

= - 14x²y + 4x²

(iv) (8yx - 2x) × 7y

= 56xy² - 14xy

(v) (4a - 8b )(4a + 8b)

• By using Identity
• (a + b)(a - b) = a² - b²

= (4a)² - (8b)²

= 16a² - 64b²

(vi) (m² + 1)(m² - 1)

By using Identity

• (a + b)(a - b) = a² - b²

= (m²)² - (1)²

= m⁴ - 1⠀⠀⠀⠀⠀[(a²)² = a²*²]

(vii) (x + 10)(x + 11)

By using identity

• (x + a)(x + b) = x² + (a + b)x + ab

= x² + (11 + 10)x + 10 × 11

= x² + 21x + 110

(viii) (2y + 3)(2y + 1)

By using identity

• (x + a)(x + b) = x² + (a + b)x + ab

= 4y² + (3 + 1)2y + 3 × 1

= 4y² + 8y + 3

(ix) (x² + 4)(x² + 2)

By using identity

• (x + a)(x + b) = x² + (a + b)x + ab

= x⁴ + (4 + 2)x² + 2 × 4

= x⁴ + 6x² + 8

(x) (5 + y)(7 + y)

• (x + a)(x + b) = x² + (a + b)x + ab

= x² + (5 + 7)x + 5 × 7

= x² + 12x + 35