Advertisements
Advertisements
प्रश्न
Expand the following, using suitable identities.
(2x + 9)(2x – 7)
Advertisements
उत्तर
We have,
(2x + 9)(2x – 7) = (2x + 9)[(2x + (–7)]
= (2x)2 + [9 + (–7)]2x + 9 × (–7) ...[Using the identity, (x + a)(x + b) = x2 + (a + b)x + ab]
= 4x2 + 4x – 63
APPEARS IN
संबंधित प्रश्न
Show that (9p - 5q)2 + 180pq = (9p + 5q)2
Simplify the following using the identities: 178 × 178 − 22 × 22
Simplify the following using the identities: 1.73 × 1.73 − 0.27 × 0.27
Find the value of x, if 4x = (52)2 − (48)2.
If (x + y + z) = 9 and (xy + yz + zx) = 26, then find the value of x2 + y2 + z2
Expand the following, using suitable identities.
`((2x)/3 - 2/3)((2x)/3 + (2a)/3)`
Expand the following, using suitable identities.
(7x + 5)2
Using suitable identities, evaluate the following.
(103)2
Using suitable identities, evaluate the following.
(1005)2
Perform the following division:
(ax3 – bx2 + cx) ÷ (– dx)
