Question

VI
3. Verify the following:
(a) 28 x (10 + (-2)] = [28 x 10] + [28 * (-2)]
(​

Answer 1

Answer:

Ncert solutions

Grade 7

Mathematics

Science

Chapters in NCERT Solutions - Mathematics, Class 7

Exercises in Integers

Question 2

Q2) Verify the following:

(a) 18 × [7 + (–3)] = [18 × 7] + [18 × (–3)]

(b) (–21) × [(– 4) + (– 6)] = [(–21) × (– 4)] + [(–21) × (– 6)]

Solution

Transcript

Solution 2:

(a) 18 × [7 + (–3)] = [18 × 7] + [18 × (–3)]

18 × [4] = [18 × 7] + [–54]

18 × [4] = 126 –54

72=72

LHS=RHS

hence verified!

(b) (–21) × [(– 4) + (– 6)] = [(–21) × (– 4)] + [(–21) × (– 6)]

(–21) × (-10) = 84 +126

210 = 210

LHS = RHS

hence verified !

Answer 2

Answer:

a×(b+c)=(a×b)+(a×c)

=distributive property

=(28×10)+(28×(-2))

=280+(-56)

=280-56

=224