Advertisements
Advertisements
Question
Use the direct method to evaluate the following products :
(5a + 16) (3a – 7)
Solution
(5a + 16) (3a – 7) = (5a × 3a) + (5a × −7) + (16 × 3a) + 16 −7
Simplify each term
(5a)(3a) = 15a2
(5a)(−7) = −35a
(16)(3a) = 48a
(16)(−7) = −112
Combine like terms
15a2 − 35a + 48a − 112
15a2 + 13a − 112
15a2 + 13a − 112
APPEARS IN
RELATED QUESTIONS
Expand the following, using suitable identity:
`[1/4a-1/2b+1]^2`
Evaluate the following using suitable identity:
(998)3
Simplify the following products:
`(2x^4 - 4x^2 + 1)(2x^4 - 4x^2 - 1)`
Evaluate of the following:
1113 − 893
Find the following product:
Find the following product:
(3x − 4y + 5z) (9x2 +16y2 + 25z2 + 12xy −15zx + 20yz)
Use the direct method to evaluate the following products :
(8 – b) (3 + b)
Use the direct method to evaluate :
(3b−1) (3b+1)
If x + y = 1 and xy = -12; find:
x2 - y2.
