Find the value of the following expressions, for a =3,b =2: |
(a) a + b |
(b) 7a-4b |
(c) \[{{a}^{2}}+2ab+{{b}^{2}}\] |
(d) \[{{a}^{3}}-{{b}^{3}}\] |
Answer:
Substituting a = 3 and b = 2 in (a) a + b, we get a + b = 3 + 2 = 5 1 (b) 7a ? 4b, we get 7a ? 4b = 7 × 3 ? 4 × 2 = 21 ? 8 = 13 (c) \[{{a}^{2}}+2ab+{{b}^{2}}\], we get \[{{a}^{2}}+2ab+{{b}^{2}}={{3}^{2}}+2\times 3\times 2+{{2}^{2}}\] = 9 + 2 × 6 + 4 = 9 + 12 + 4 = 25. 1 (d)\[{{a}^{3}}{{b}^{3}}\], we get \[{{a}^{3}}{{b}^{3}}={{3}^{3}}{{2}^{3}}=3\times 3\times 32\times 2\times 2\] = 27 ? 8 = 19. 1
You need to login to perform this action.
You will be redirected in
3 sec