Question

20. If a + b = 7 and a - b = 4, then find the
value of ab.
55
(a)
4
65
(b).
2
33
(c)
(d) 1​

Answer 1

Answer:

ab= 33/4

Step-by-step explanation:

1. a+b=7. eq. 1 a-b=4. eq.2 from eq1 a=7-b eq3. so substitute eq3 in eq2 we get 7-b-b=4. 7-2b=4. -2b=4-7. b=3/2. a=11/2. ab =33/4. hope it helps