Advertisements
Advertisements
Question
Use the direct method to evaluate :
(0.5−2a) (0.5+2a)
Solution
Note: (a+b) (a−b) = a2 − b2
(0.5−2a) (0.5+2a)
= (0.5)2 − (2a)2
= 0.25 − 4a2
APPEARS IN
RELATED QUESTIONS
Write the following cube in expanded form:
`[x-2/3y]^3`
If a − b = 4 and ab = 21, find the value of a3 −b3
Find the following product:
(4x − 5y) (16x2 + 20xy + 25y2)
Find the following product:
\[\left( \frac{3}{x} - \frac{5}{y} \right) \left( \frac{9}{x^2} + \frac{25}{y^2} + \frac{15}{xy} \right)\]
If x = 3 and y = − 1, find the values of the following using in identify:
(9y2 − 4x2) (81y4 +36x2y2 + 16x4)
\[\frac{( a^2 - b^2 )^3 + ( b^2 - c^2 )^3 + ( c^2 - a^2 )^3}{(a - b )^3 + (b - c )^3 + (c - a )^3} =\]
Evalute : `( 7/8x + 4/5y)^2`
Evaluate: `(2"a"+1/"2a")(2"a"-1/"2a")`
If p2 + q2 + r2 = 82 and pq + qr + pr = 18; find p + q + r.
Simplify:
`("a" - 1/"a")^2 + ("a" + 1/"a")^2`
