How do I work this out

4 cm²

Step-by-step explanation:

First use Pythagorean theorem to find BD.

c² = a² + b²

(2√5)² = (3√2)² + b²

20 = 18 + b²

b = √2

Now find the areas of ΔABD and ΔCBD.

A = ½wh

A = ½(3√2)(√2) + ½(√2)(√2)

A = 3 + 1

A = 4

use substitution to solve each system of equations. y = x + 5 3x + y = 25 62/87,21 y = x + 5 3x + y = 25 substitute x + 5 for y in the second equation. substitute the solution for x into either equation to find y. the solution is (5, 10)

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step-by-step explanation:

x = ± 6i

step-by-step explanation:

x^2 = -36

take the square root of each side

sqrt(x^2) = sqrt(-36)

we know sqrt(ab) = sqrt(a) sqrt(b)

x = ±sqrt(36) sqrt(-1)

we know that sqrt (-1) = i

x = ± 6i