If $a * b = a + b - 5$ , find $8 * (- 4)$ and $(- 4) * 8 .$
Is $8 * (- 4)$ $=$ $(- 4) * 8 ?$

Open in App

Solution

Given, $a * b = a + b - 5$
So, $8 * (- 4)$ $= 8 + (- 4) - 5 = 4 - 5 = - 1$
and $(- 4) * 8 = (- 4) + 8 - 5 = 4 - 5 = - 1$
Clearly we can observe that $8 * (- 4)$ $=$ $(- 4) * 8$ .

Suggest Corrections

Similar questions

If $\frac{4 x + 8}{5 x + 8} = \frac{5}{6}$ , then x = ?

(a) 4

(b) 6

(d) 12

Mark (✓) against the correct answer
If 2A = 3B and 4B = 5C, then A : C = ?
(a) 4 : 3
(b) 8 : 15
(c) 3 : 4
(d) 15 : 8

Simplify these expressions and find their values if x = 3, a = − 1, b = − 2.

(i) 3x − 5 − x + 9 (ii) 2 − 8x + 4x + 4

(iii) 3a + 5 − 8a + 1 (iv) 10 − 3b − 4 − 5b

(v) 2a − 2b − 4 − 5 + a

Q. If

{log}_{8} a + {log}_{4} b^{2} = 5, {log}_{8} b + {log}_{4} a^{2} = 7

, then find the value of

a b

$[(- 8) \times (- 3)] \times (- 4)]$ is not equal to

(a) $(- 8) \times [(- 3) \times (- 4)]$
(b) $[(- 8) \times (- 4)] \times (- 3)$
(c) $[(- 3) \times (- 8)] \times (- 4)$
(d) $(- 8) \times (- 3) - (- 8) \times (- 4)$

Join BYJU'S Learning Program

Ifa*b=a+b-5, find 8*(-4) and (-4)*8.Is 8*(-4) = (-4)*8?

Given, a*b=a+b-5 So,8*(-4)=8+(-4)-5=4-5=-1and (-4)*8=(-4)+8-5=4-5=-1Clearly we can observe that 8*(-4) = (-4)*8.

If $a * b = a + b - 5$ , find $8 * (- 4)$ and $(- 4) * 8 .$
Is $8 * (- 4)$ $=$ $(- 4) * 8 ?$

Given, $a * b = a + b - 5$
So, $8 * (- 4)$ $= 8 + (- 4) - 5 = 4 - 5 = - 1$
and $(- 4) * 8 = (- 4) + 8 - 5 = 4 - 5 = - 1$
Clearly we can observe that $8 * (- 4)$ $=$ $(- 4) * 8$ .