Question 85 (vi)

Expand the following, using suitable identities.

$(x + 3) (x + 7)$

Open in App

Solution

We have,
$(x + 3) (x + 7) = x^{2} + (3 + 7) x + 3 \times 7$
[using the identity, $(x + a) (x + b) = x^{2} + (a + b) x + a b$ ]
$= x^{2} + 10 x + 21$

Suggest Corrections

Similar questions

Question 85 (vi)

Expand the following, using suitable identities.

$(x + 3) (x + 7)$

Question 85 (iv)

Expand the following, using suitable identities.

${(\frac{2}{3} x - \frac{3}{2} y)}^{2}$

Question 85 (vii)

Expand the following, using suitable identities.

$(2 x + 9) (2 x - 7)$

Question 85 (xiv)

Expand the following, using suitable identities.

$(7 x + 5)^{2}$

Question 85 (x)

Expand the following, using suitable identities.

$(2 x - 5 y) (2 x - 5 y)$

Join BYJU'S Learning Program

Explore more

Join BYJU'S Learning Program