Question

a
EXERCISE 1.3
Find each of the following products:
(a) 3x (-1)
(b) (-1) 225
(c) (-21) (-30)
(d) (-316) (-1)
(e) (-15) 0 (-18) (f) (-12) × (-11) X (10)
(g) 9X(-3) X (-6)
(h) (-18) X (-5) × (-4)
() (-1) X (-2) (-3) x 4 (j) (-3) (-6) * (-2) (-1)
2. Verify the following:
(a) 18 x [7+(-3)] = [18 x 7] + [18 (-3)]
(b) (-21) [(-4) + (-6)] = [(-21) × (-4)] + [(-21) (-6)​

Answer 1

Answer:

(a) 3 × (-1) = -3 × 1 = -3

(b) (-1) × 225 = -1 × 225 = -225

(c) (-21) × (-30) = (-) × (-) × 21 × 30 = 630

(d) (-316) × (-1) = (-) × (-) × 316 × 1 = 316

(e) (-15) × 0 × (-18) = 0 [∵ a × 0 = a]

(f) (-12) × (-11) × (10)

= (-) × (-) × 12 × 11 × 10 = 1320

(g) 9 × (-3) × (-6) = (-3) × (-6) × 9

= (—) × (-) × 3 × 6 × 9 = 162

(h) (-18) × (-5) × (-4)

= (-) × (-) × (-) × 18 × 5 × 4 = -360

(i) (-1) × (-2) × (-3) × 4

= (-) × (-) × (-) × 1 × 2 × 3 × 4 = -24

(j) (-3) × (-6) × (-2) × (-1)

= (-) × (-) × (-) × (-) × 3 × 6 × 2 × 1 = 36

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Answer 2

Answer:

(a)3x(-1). (b)(-1)225

=-3x =-225

(c)-21(-30). (d)(-361)(-1)

=63 =361

(e)(-15)0(-18). (f)(-21)×(-11)×10

=0 =2310

(g)9x(-3)×(-6)। (h)(-18)×(-5)×(-4)

=162 =-360

(I)(-1)×(-2)(-3)4। (j)(-3)(-6)(-2)(-1)

=-24 =36

verify the following questions:

LHS,

(a)18×[7+(-3)]

=18×4

=72

RHS,

[18×7]+[18(-3)]

=126-54

=72

Hence,LHS=RHS

(proved)

(b)LHS,

(-21)[(-4)+(-6)]

=(-21)(-10)

=210

Again RHS,

[(-21)(-4)]+[(-21)(-6)

=84+126

=210

Hence,

LHS=RHS

(proved)

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