Advertisements
Advertisements
Question
Use the direct method to evaluate the following products :
(y + 5)(y – 3)
Advertisements
Solution
(y + 5) (y – 3) = (y × y) + (y × −3) + (5 × y) + (5 × −3)
= y2 + (−3y) + (5y) − 15
= y2 − 3y + 5y − 15
= y2 + 2y − 15
APPEARS IN
RELATED QUESTIONS
Factorise the following:
8a3 – b3 – 12a2b + 6ab2
If x = 3 and y = − 1, find the values of the following using in identify:
\[\left( \frac{3}{x} - \frac{x}{3} \right) \left( \frac{x^2}{9} + \frac{9}{x^2} + 1 \right)\]
Evaluate:
483 − 303 − 183
Simplify by using formula :
(1 + a) (1 - a) (1 + a2)
Simplify by using formula :
`("a" + 2/"a" - 1) ("a" - 2/"a" - 1)`
Evaluate, using (a + b)(a - b)= a2 - b2.
399 x 401
If `x + (1)/x = 3`; find `x^4 + (1)/x^4`
Simplify:
(3x + 5y + 2z)(3x - 5y + 2z)
Expand the following:
(–x + 2y – 3z)2
Find the following product:
`(x/2 + 2y)(x^2/4 - xy + 4y^2)`
