Advertisements
Advertisements
प्रश्न
Show that: (3x + 7)2 − 84x = (3x − 7)2
Advertisements
उत्तर
\[ \text { LHS } = \left( 3x + 7 \right)^2 - 84x\]
\[ = \left( 3x + 7 \right)^2 - 4 \times 3x \times 7\]
\[ = \left( 3x - 7 \right)^2 \left[ \because \left( a + b \right)^2 - 4ab = \left( a - b \right)^2 \right]\]
= RHS
Because LHS is equal to RHS, the given equation is verified.
APPEARS IN
संबंधित प्रश्न
Find each of the following product:
−3a2 × 4b4
Write down the product of −8x2y6 and −20xy. Verify the product for x = 2.5, y = 1.
Find the following product: \[\frac{6x}{5}( x^3 + y^3 )\]
Find the product −3y(xy + y2) and find its value for x = 4 and y = 5.
Multiply:
(3x2y − 5xy2) by \[\left( \frac{1}{5} x^2 + \frac{1}{3} y^2 \right)\].
Multiply:
(2x2 − 1) by (4x3 + 5x2)
Find the following product and verify the result for x = − 1, y = − 2:
(3x − 5y) (x + y)
Simplify:
(x2 − 3x + 2)(5x − 2) − (3x2 + 4x − 5)(2x − 1)
Multiply:
(12a + 17b) × 4c
What is the product of (x + 3) and (x − 5)?
