Solving Exponential Equations with Desmos

What tool is being used to solve exponential equations in this video?

• Graphing Paper

• Calculator

• Desmos

• Spreadsheet

What is the first step in solving an equation using Desmos?

• Type the left-hand side in one blank and the right-hand side in another

• Guess the answer

• Use a calculator

• Type the equation directly

Tags

CCSS.7.EE.B.4A

In the first example, what is the intersection point of 15^x and y=98?

• 1.582

• 1.693

• 0.194

• 0.078

What is the x-value of the intersection for the equation 15^x = 98?

• 0.078

• 1.693

• 1.582

• 0.194

Tags

CCSS.HSF.LE.A.4

In the second example, what is the x-value of the intersection for 12^x = 51?

• 1.582

• 1.693

• 0.194

• 0.078

What happens if you type 'r' instead of 'x' in Desmos?

• It adds a slider

• It does nothing

• It shows an error

• It solves the equation

Tags

CCSS.8.EE.C.7B

In the third example, what is the x-value of the intersection for 16^(-8x) + 2 = 76?

• 0.078

• 0.194

• 1.693

• 1.582

What must you remember to do when typing exponents in Desmos?

• Use colons

• Use commas

• Use parentheses

• Use brackets

Tags

CCSS.HSF-IF.C.7E

In the final example, what is the x-value of the intersection for 5 * 14^(9x) = 32?

• 0.078

• 1.582

• 1.693

• 0.194

What is a quick way to solve exponential equations according to the video?

• Using a calculator

• Using a spreadsheet

• Using Desmos to find intersections

• Guessing the answer