c) (7a - b)²

Q: c) (7a - b)²

The expression is $(7a - b)^2$. To expand this, use the formula for the square of a binomial: \[ (a - b)^2 = a^2 - 2ab + b^2 \] Applying it to $(7a - b)^2$: 1. Square the first term: $(7a)^2 = 49a^2$ 2. Multiply the two terms and double it: $2 \times 7a \times b = 14ab$ 3. Square the last term: $(-b)^2 = b^2$ So, the expanded form is: \[49a^2 - 14ab + b^2\]

Question

c) (7a - b)²

Accepted Answer

The expression is $(7a - b)^2$.

To expand this, use the formula for the square of a binomial:

$$
(a - b)^2 = a^2 - 2ab + b^2
$$

Applying it to $(7a - b)^2$:

1. Square the first term: $(7a)^2 = 49a^2$
2. Multiply the two terms and double it: $2 \times 7a \times b = 14ab$
3. Square the last term: $(-b)^2 = b^2$

So, the expanded form is:

$$49a^2 - 14ab + b^2$$