Question

please help......fast​

Answer 1

Answer:

-36.764

Step-by-step explanation:

= 3√32 - 2√50 + 4√128 - 20√18

= 3√2×2×2×2×2 - 2√2×5×5 +  4√2×2×2×2×2×2×2 - 20√3×3×2

= 3×2×2√2 - 2×5√2 + 4×2×2×2√2 - 20×3√2

= 12√2 - 10√2 + 32√2 - 60√2

= 12√2 + 32√2 - 10√2 - 60√2

= 44√2 - 70√2

= -26√2

= -26 × 1.414

= -36.764

Answer 2

Your answer is 138.572

step by step explanation:

We know that ;

$\sqrt{2} = 1.414$

(1)

$3 \sqrt{32} = 3 \times \sqrt{2} \times \sqrt{16}$

$= 3 \times 4 \times \sqrt{2}$

$= 12 \sqrt{2}$

(2)

$2 \sqrt{50} = 2 \times \sqrt{2} \times \sqrt{25}$

$= 2 \times \sqrt{2} \times 5$

$= 10 \sqrt{2}$

(3)

$4 \sqrt{128} = 4 \times \sqrt{2} \times \sqrt{64}$

$= 4 \times \sqrt{2} \times 8$

$= 16 \sqrt{2}$

(4)

$20 \sqrt{18} = 20 \times \sqrt{2} \times \sqrt{9}$

$= 20 \times 3 \times \sqrt{2}$

$= 60 \sqrt{2}$

Question :

$3 \sqrt{32} - 2 \sqrt{50} + 4 \sqrt{128} - 20 \sqrt{18}$

Plugging the values :

$= 12 \sqrt{2} + 10 \sqrt{2} + 16 \sqrt{2} + 60 \sqrt{2}$

As we mentioned above ;

$\sqrt{2} = 1.414$

Substitute the value of Root 2 :

$= 12 \times 1.414 + 10 \times 1.414 + 16 \times 1.414 + 60 \times 1.414$

$= 138.572$

So your answer is 138.572

Hope it is clear :-)