Datrys -(6a-3b)^2-(3b+2a)^2=

$$- ( 6 a - 3 b ) ^ { 2 } - ( 3 b + 2 a ) ^ { 2 } =$$

Enrhifo

$$-40a^{2}+24ab-18b^{2}$$

Camau Ateb

Defnyddio'r theorem binomaidd \left(p-q\right)^{2}=p^{2}-2pq+q^{2} i ehangu'r \left(6a-3b\right)^{2}.

$$-\left(36a^{2}-36ab+9b^{2}\right)-\left(3b+2a\right)^{2}$$

I ddod o hyd i wrthwyneb 36a^{2}-36ab+9b^{2}, dewch o hyd i wrthwyneb pob term.

$$-36a^{2}+36ab-9b^{2}-\left(3b+2a\right)^{2}$$

Defnyddio'r theorem binomaidd \left(p+q\right)^{2}=p^{2}+2pq+q^{2} i ehangu'r \left(3b+2a\right)^{2}.

$$-36a^{2}+36ab-9b^{2}-\left(9b^{2}+12ba+4a^{2}\right)$$

I ddod o hyd i wrthwyneb 9b^{2}+12ba+4a^{2}, dewch o hyd i wrthwyneb pob term.

$$-36a^{2}+36ab-9b^{2}-9b^{2}-12ba-4a^{2}$$

Cyfuno -9b^{2} a -9b^{2} i gael -18b^{2}.

$$-36a^{2}+36ab-18b^{2}-12ba-4a^{2}$$

Cyfuno 36ab a -12ba i gael 24ab.

$$-36a^{2}+24ab-18b^{2}-4a^{2}$$

Cyfuno -36a^{2} a -4a^{2} i gael -40a^{2}.

$$-40a^{2}+24ab-18b^{2}$$

Ehangu

$$-40a^{2}+24ab-18b^{2}$$

Camau Ateb

Defnyddio'r theorem binomaidd \left(p-q\right)^{2}=p^{2}-2pq+q^{2} i ehangu'r \left(6a-3b\right)^{2}.

$$-\left(36a^{2}-36ab+9b^{2}\right)-\left(3b+2a\right)^{2}$$

I ddod o hyd i wrthwyneb 36a^{2}-36ab+9b^{2}, dewch o hyd i wrthwyneb pob term.

$$-36a^{2}+36ab-9b^{2}-\left(3b+2a\right)^{2}$$

Defnyddio'r theorem binomaidd \left(p+q\right)^{2}=p^{2}+2pq+q^{2} i ehangu'r \left(3b+2a\right)^{2}.

$$-36a^{2}+36ab-9b^{2}-\left(9b^{2}+12ba+4a^{2}\right)$$

I ddod o hyd i wrthwyneb 9b^{2}+12ba+4a^{2}, dewch o hyd i wrthwyneb pob term.

$$-36a^{2}+36ab-9b^{2}-9b^{2}-12ba-4a^{2}$$

Cyfuno -9b^{2} a -9b^{2} i gael -18b^{2}.

$$-36a^{2}+36ab-18b^{2}-12ba-4a^{2}$$

Cyfuno 36ab a -12ba i gael 24ab.

$$-36a^{2}+24ab-18b^{2}-4a^{2}$$

Cyfuno -36a^{2} a -4a^{2} i gael -40a^{2}.

$$-40a^{2}+24ab-18b^{2}$$