Datrys sqrt{4}(7a+6ab+sqrt{4})-2(-7ab-3a+2)=

$$\sqrt { 4 } ( 7 a + 6 a b + \sqrt { 4 } ) - 2 ( - 7 a b - 3 a + 2 ) =$$

Enrhifo

$$26ab+20a$$

Camau Ateb

Cyfrifo ail isradd 4 a chael 2.

$$2\left(7a+6ab+\sqrt{4}\right)-2\left(-7ab-3a+2\right)$$

Cyfrifo ail isradd 4 a chael 2.

$$2\left(7a+6ab+2\right)-2\left(-7ab-3a+2\right)$$

Defnyddio’r briodwedd ddosbarthu i luosi 2 â 7a+6ab+2.

$$14a+12ab+4-2\left(-7ab-3a+2\right)$$

Defnyddio’r briodwedd ddosbarthu i luosi -2 â -7ab-3a+2.

$$14a+12ab+4+14ab+6a-4$$

Cyfuno 12ab a 14ab i gael 26ab.

$$14a+26ab+4+6a-4$$

Cyfuno 14a a 6a i gael 20a.

$$20a+26ab+4-4$$

Tynnu 4 o 4 i gael 0.

$$20a+26ab$$

Gwahaniaethu w.r.t. a

$$26b+20$$